Do you think you'd vend only until the end of halftime? How early does the tailgating start? Do you have any numbers for how many people you can handle serving per hour with your setup?
When we've hit festivals and the ilk we generally just pick a target number that we want to serve based on suspected attendance, other vendors and how long we can handle being there.
Big Red, the custom built smoker of my dreams...and only getting more custom by the day.